There's some fun to be had by trying different transistors and diodes.
Source :
http://www.talkingelectronics.com/projects/200TrCcts/200TrCcts.html#27
From page :
The output of a guitar is connected to the input of the Fuzz circuit. The output of this circuit is connected to the input of your amplifier.
With the guitar at full volume, this circuit is overdriven and distorts. The distorted signal is then clipped by the diodes and your
